Full movie description "Goodbye Gemini":

Unnaturally close twin siblings Jacki and Julian become enmeshed in the swinging London scene, where they attract the attention of the heavily endebted gambler Clive. Seeing a way out of his debts, Clive sets Julian up for a blackmail scheme, setting in motion a nightmarish sequence of events.

Reviews of the Goodbye Gemini

Infantile psychotic twins Jacki and Julian (Judy Geeson and Martin Potter) arrive in London, immediately arranging an accident for their grouchy landlady so that they can have the run of the place. The siblings then set about experiencing the swinging London party scene, where they meet louche rogue Clive (Alexis Kanner, sporting some impressive mutton-chops). After Clive is roughed up by a bookmaker to whom he owes £400, he tricks Julian into bed with a pair of transvestites, takes a few photos and proceeds to blackmail the young man. However, instead of getting cash for his troubles, Clive gets knifed in the neck instead.

As a child of the '70s, I have an affinity with films from that era, especially those set in the UK, but Goodbye Gemini was a tough one to endure. It's horrible, hippy nonsense that features hedonistic characters hard to sympathise with, atrocious dialogue, and incomprehensible behaviour from all involved. An incestuous relationship between the inseparable twins is hinted at, which adds an edginess to proceedings, the music is groovy, and there are a couple of outrageously camp homosexuals who are mildly amusing (one wears a bright pink shirt and uses the word 'ducky' a lotyou don't get much more '70s than that!), but there really is very little else worthy of mention.